Abstract
The effect of the N2 content in secondary recrystallization annealing atmosphere on magnetic properties and secondary recrystallization behavior in 2.3% Si-1.7% Mn steel containing 0.008% sol.Al was investigated from the viewpoint of inhibitor nitride precipitation. The specimens were secondary recrystallization annealed with two stage heat cycle, in which first stage was the 875°C soaking in 5, 25 and 50 vol% N2 - H2 gases for nitrogenizing and second stage was the 950 °C soaking in 100vol% H2 gas for purification. 25vol% N2 gas of the 875 °C soaking leads to the best magnetic properties and complete secondary recrystallization after full annealing. On the other hand, other N2 contents result in poor magnetic properties and incomplete secondary recrystallization. Complete secondary recrystallization of 25vol% N2 annealing is explained by the appropriate inhibitor effect of the nitrides through the nitrogenizing. This appropriate inhibitor effect is considered to result when the product of R and Z, which are average grain radius and Zener term respectively, is situated in the range of 0.8 to 1.0 after the heating stage of the 875°C soaking.
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